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Message-ID: <5cf132c0709300328t6a2b94ex34824ae2a72495bb@mail.gmail.com>
Date: Sun, 30 Sep 2007 05:28:07 -0500
From: "Mark Steitle" <msteitle@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Another cooling question
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ED wrote:
<snip>
 Mark, if you really had excess air flowing through your radiators the
coolant would drop more than 4 Deg F.  In fact, the more air flow the more
coolant Delta T you would drop through the radiator.
<snip>

That's exactly what I HAD thought, until I was told that the air could pass
through too fast and not pick up as much heat.  This didn't make sense to
me.  Maybe I wasn't listening closely and missed the point altogether
(wouldn't be the first time).

What I DO know is that the air is flowing faster through the water radiator
than the oil radiator.  (I'm not sure I have the ASI's hooked up correctly,
but they're both hooked up the same).  I have a pitot behind each radiator
hooked up to two separate ASI's.  In slow cruise, say 125-130 kts, the water
radiator ASI will read about 110knts and the oil ASI will read about 90
kts.  The way it was behaving before I opened up the exit, it appeared that
the air from the water radiator was trying to exit backwards through the oil
inlet.  I say this because of how high the oil temps were reading.
I enlarged the cowl exit, and both the water and oil temps dropped
significantly.

The ASI's are referencing the static port for these readings; should they be
referencing cowl or cabin pressure instead?  Airspeeds readings seem awfully
high to me.

Mark
(Going to the airport today to recalibrate temp sensors)

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<div>ED wrote:</div>
<div>&lt;snip&gt;</div>
<div>&nbsp;Mark, if you really had excess air flowing through your radiators the coolant would drop more than 4 Deg F.&nbsp; In fact, the more air flow the more coolant Delta T you would drop through the radiator.&nbsp;</div>
<div>&lt;snip&gt;</div>
<div>&nbsp;</div>
<div>That&#39;s exactly what I HAD thought, until I was told that the air could pass through too fast and not pick up as much heat.&nbsp; This didn&#39;t make sense to me.&nbsp; Maybe I wasn&#39;t listening closely and missed the point altogether (wouldn&#39;t be the first time).&nbsp; 
</div>
<div>&nbsp;</div>
<div>What I DO know is that the air is flowing faster through the water radiator than the oil radiator.&nbsp; (I&#39;m not sure I have the ASI&#39;s hooked up correctly, but they&#39;re both hooked up the same).&nbsp; I have a pitot behind each radiator hooked up to two separate ASI&#39;s.&nbsp; In slow cruise, say 125-130 kts, the water radiator ASI will read about 110knts and the oil ASI will read about 90 kts.&nbsp; The way it was behaving before I opened up the exit, it appeared that the&nbsp;air from the water radiator was trying to exit backwards&nbsp;through the oil inlet.&nbsp; I say this because of how high the oil temps were reading.&nbsp; I&nbsp;enlarged the cowl exit, and both the&nbsp;water and oil temps dropped significantly.&nbsp; 
</div>
<div>&nbsp;</div>
<div>The ASI&#39;s are referencing the static port for these readings; should they be referencing cowl or cabin pressure instead?&nbsp; Airspeeds readings seem awfully high to me.&nbsp; </div>
<div>&nbsp;</div>
<div>Mark</div>
<div>(Going to the airport today to recalibrate temp sensors)</div>
<div>&nbsp;</div>

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